PASSING CALLBACK URL ON requesttopay RETURNS 400 BAD Request

The request below works fine but it returns 400 Bad request as soon as i add callback url in the header. I believe the callback url is the best option than my system calling your server periodilly to confirm if the payment request was successful or not. POST https://sandbox.momodeveloper.mtn.com/collection/v1_0/requesttopay HTTP/1.1 Host: sandbox.momodeveloper.mtn.com Authorization: Bearer ****** X-Reference-Id: c2f3ff93-c46a-402c-be42-94e1b64b8951 X-Target-Environment: sandbox Content-Type: application/json Ocp-Apim-Subscription-Key: •••••••••••••••••••••••••••••••• { "amount": "100", "currency": "EUR", "externalId": "5427", "payer": { "partyIdType": "MSISDN", "partyId": "25678*******" }, "payerMessage": "Payment for Order No:5427", "payeeNote": "Payment for Order No:5427" }


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